Single trunk compound engine



(No Model) J. FISH SINGLE TRUNK GOMPOUND ENGINE.

Patented Dec 5, 1882.

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UNITED STATES JOHN FISH, OF SUMMIT, NEW JERSEY.

SINGLE-TRUNK COMPOUND ENGINE.-

SPECIFICATION forming part of Letters Patent No. 268,477, dated December 5, 1882 Application filed February 24, 1882. (No model.)

To all whom it may concern:

Be it known that I, JOHN FISH, of Summ t, in the county otUnion and State of New Jersey, have invented a new and useful Improvement in Single-Trunk Compound Engines, of which the following is a specification.

My invention relates to that class of engines where a single trunkconnected to a piston larger in diameter than the trunk is used with a steam-cylinder and a trunk-easing as a. compound engine.

The object of my improvement is,first, to use a trunk casing of sufiicient length that when the trunk and piston are at the outward ex tremity of their throw the trunk-easingsh all in its length extend to the end of the trunk. At the inward end of the trunkcasing, where it fits into the steam-c linder, a recess is formed,

into which a collapsible packing-ring to fit the turned trunk is placed and held in place by a follower. At the outer endof the trunk a recess is turned, into which an expanding ring is placed, also secured by a follower. This expanding ring is turned and tits the trunk-casing, being open to and easy of access without removing the piston and trunk from its'eylinder and trunk-casin Under certain conditions the expanding packing ring or rings at the outer end of the trunk would be sut'h'cient to prevent steam-leakage, but with highpressures the combination of the collapsible ring on the trunk and the expanding ring on the casing would make a more lasting and certain provision against leakage.

The relative position of the collapsible packing-ring in the trunk-casing to the expanding packing-ring in the trunk is such that there is sufficient distance between them to prevent them from coming in contact, and when the trunk is atthe outer end of its stroke the trunk-casing is of sufficient length to give a bearing to the trunk packing-ring. WVhen steam is admitted to the high-pressure side of the piston leakage between the trunk and its easing into the air is prevented by the 5 expanding ring in the trunk, aided by the partial condensation of the lilm of steam between the outside body of the trunk and its casing. Where high pressures of steam are used I place a collapsible ring in the inner end of the casing, and should any steam escape past the first ring it becomes trapped in between it and the outer ring and is partially condensed, and forms an efficient packing and lubricant between the trunk and its casing in the back and forward strokes of the trunk in its casing. The casing forms an efficient support and guide, in whatever position the trunk may he, and by means of the parking-rings, single or combined, a sure provision against leakage is simply and easily provided. I obtain this result by the mechanism illustrated in the accompanying drawings, in which-- Figure 1 represents a transverse section through the line a: m in Fig. 3. Fig. 2 represents an end view of the trunk C. Fig. 3 represents a plan view ofFig.

Similar letters refer to similar parts throughout the several views. I

A, steam-cylinder; B, slide-valve; 0, piston-trunk; E, expanding ring in. trunk; F, collapsible ring in trunk-casing; K, trunkcasing.

What I claim as my invention, and desire to secure by Letters Patent, is-

lo a compound engine having a single trunk and a trunkcasing extending the length of the stroke of the trunk. the combination of an expansible packing at the outer end of the trunk and a collapsible packing at the inner end of the trunk-easing, substantially as described.

JOHN FISH. Witnesses:

howl). H. H. FoRDER, HENRY C. FREEMAN. 

